Quality Control

Quality Control - Statistical Process Control (Quality...

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Statistical Process Control (Quality Control) A process is a chain of activities that turns inputs into outputs. Examples would include a manufacturing process in which an item is produced, an administrative process in which a decision is reached, etc. A process is like a population containing all the outputs that would be produced by the process if it ran forever in its present state. The outputs produced today or this week are a sample from this population. The idea of statistical process control Goal: make a process stable over time and keep it stable unless planned changes are made. All processes have variation. Statistical stability means the pattern of variation remains stable, not that there is no variation in the variable measured. (In control ) Common cause variation A process that is in control only has common cause variation. Common cause variation is the inherent variability of the system, due to many small causes that are always present. Special cause variation When the normal functioning of the process is disturbed by some unpredictable event, special cause variation is added to the common cause variation.
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This note was uploaded on 02/28/2012 for the course STAT 301 taught by Professor Staff during the Spring '08 term at Purdue.

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Quality Control - Statistical Process Control (Quality...

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